Cavity-enhanced optical Hall effect in twodimensional free charge carrier gases detected at terahertz frequencies

S. Knight, S. Schöche, V. Darakchieva, P. Kühne, J. F. Carlin, N. Grandjean, C. M. Herzinger, M. Schubert, T. Hofmann

Research output: Contribution to journalArticle

12 Scopus citations

Abstract

The effect of a tunable, externally coupled Fabry-Perot cavity to resonantly enhance the optical Hall effect signatures at terahertz frequencies produced by a traditional Drudelike two-dimensional electron gas is shown and discussed in this Letter. As a result, the detection of optical Hall effect signatures at conveniently obtainable magnetic fields, for example, by neodymium permanent magnets, is demonstrated. An AlInN/GaN-based high-electron mobility transistor structure grown on a sapphire substrate is used for the experiment. The optical Hall effect signatures and their dispersions, which are governed by the frequency and the reflectance minima and maxima of the externally coupled Fabry-Perot cavity, are presented and discussed. Tuning the externally coupled Fabry-Perot cavity strongly modifies the optical Hall effect signatures, which provides a new degree of freedom for optical Hall effect experiments in addition to frequency, angle of incidence, and magnetic field direction and strength.

Original languageEnglish (US)
Pages (from-to)2688-2691
Number of pages4
JournalOptics Letters
Volume40
Issue number12
DOIs
StatePublished - 2015

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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    Knight, S., Schöche, S., Darakchieva, V., Kühne, P., Carlin, J. F., Grandjean, N., Herzinger, C. M., Schubert, M., & Hofmann, T. (2015). Cavity-enhanced optical Hall effect in twodimensional free charge carrier gases detected at terahertz frequencies. Optics Letters, 40(12), 2688-2691. https://doi.org/10.1364/OL.40.002688